Sustainable Aviation Fuel: Understanding Wake-Diffusion Dynamics

What is Wake-Diffusion?

Wake-diffusion refers to the process by which emissions from aircraft engines, particularly water vapor, are dispersed in the atmosphere. This phenomenon is crucial for understanding contrail formation and its impact on climate change.

The wake-diffusion diagram simulates this dispersion using an advection-diffusion model that tracks the movement of ice crystals based on their age and vertical spread.

How Does Wake-Diffusion Work?

Wake-diffusion is governed by the principles of fluid dynamics, where emissions are advected (transported) by the wind and diffused due to turbulence. The advection-diffusion model used in the diagram accounts for these processes.

The ISA-lapse rate at -40°C marks a critical threshold: below this temperature, ice crystals can form, leading to contrail formation.

Why Does Wake-Diffusion Matter?

Wake-diffusion is significant because it helps in understanding the environmental impact of aviation on climate change. Contrails can act as cloud-like structures that reflect sunlight and trap heat, contributing to global warming.

By simulating different scenarios with varying SAF blends and flight distances, researchers can assess the potential benefits of using sustainable fuels.

Real-World Applications

The wake-diffusion diagram is used by airlines and policymakers to make informed decisions about fuel choices that minimize environmental impact.

It also aids in developing strategies for mitigating contrail-related climate effects, such as optimizing flight routes or times.

Frequently asked questions

Try it live

Everything above runs in your browser — open Sustainable Aviation Fuel: Wake-Diffusion Diagram and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.